I have long noticed that on some especially protected ) hosting when installing the plugin WordPress requires ftp input. Today I found a solution to this problem. You can just specify passwords for ftp by default. But it is better to make a separate user for such purposes ftp.

define("FTP_HOST", "");
define("FTP_USER", "");
define("FTP_PASS", "");

Add this code to the file config.php, fill in the required fields for ftp login and enjoy working with the coolest engine ).